Invalidity Patent search also known as ‘knock out’ patent search. This search is conducted to invalidate the independent claims of competitors. If a invalidate claims get invalidate, the dependant claims automatically gets invalidate. It is a prior art search done after a patent has been issued.
The most usual cause of invalidating a patent is its power to abstract one’s commercial activities. It is mainly done by the defendants in case of patent infringement. It is basically research of patent where there is already litigation and a case against the patent has been filed to invalidate the patent application.